Swift Concurrency時代のリアクティブプログラミングの基礎理解

iOSDC Japan 2022

CfP: https://fortee.jp/iosdc-japan-2022/proposal/397d52a7-8f62-4c40-8392-2dc081227189

YouTube Archive (TBA)

Transcript

1. Swift Concurrency࣌୅ͷ
 ϦΞΫςΟϒϓϩάϥϛϯάͷجૅཧղ iOSDC Japan 2022 גࣜձࣾZOZO ςοΫϦʔυ ͹Μ͡ΎΜ! / @banjun Copyright © ZOZO, Inc.
2. © ZOZO, Inc. 2 גࣜձࣾZOZO ςοΫϦʔυ ZOZOTOWN iOS ͹Μ͡ΎΜ! / @banjun -PWF-JWFS
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3. © ZOZO, Inc. https://zozo.jp/ 3 • ϑΝογϣϯEC • 1,500Ҏ্ͷγϣοϓɺ8,500Ҏ্ͷϒϥϯυͷऔΓѻ͍ • ৗ࣌90ສ఺Ҏ্ͷ঎඼ΞΠςϜ਺ͱຖ೔ฏۉ2,600఺Ҏ্ͷ৽ண
 ঎඼Λܝࡌʢ2022೥6݄຤࣌఺ʣ • ϒϥϯυݹணͷϑΝογϣϯκʔϯʮZOZOUSEDʯ΍ ίεϝઐ໳ϞʔϧʮZOZOCOSMEʯɺۺͷઐ໳Ϟʔϧ ʮZOZOSHOESʯɺϥάδϡΞϦʔˍσβΠφʔζκʔϯ ʮZOZOVILLAʯΛల։ • ଈ೔഑ૹαʔϏε • ΪϑτϥοϐϯάαʔϏε • πέ෷͍ ͳͲ
4. © ZOZO, Inc.
5. جૅγϦʔζ΁Α͏ͦ͜
6. © ZOZO, Inc. 6 جૅγϦʔζ΁Α͏ͦ͜ ʮجૅʯͬͯ
   "
   ͳΜ͔؆୯ͦ͏ͩ͠ྑͦ͞͏
   #
   ͳΜ͔ාͦ͏
7. © ZOZO, Inc. 7 جૅγϦʔζ΁Α͏ͦ͜ ;0;0Ͱ͸ʮجૅʯʮΑ͘Θ͔Δʯ γϦʔζͷࣾ಺ษڧձΛ΍ͬͯ·͢
   $
   ϓϩμΫτͷण໋͸ϥΠϒϥϦ ΍ύϥμΠϜͷण໋ΑΓ௕͍
   %
   ৗʹਖ਼ղͷʮٕज़બఆʯ͕͋Δ Θ͚͡Όͳ͍
8. جૅ Ԡ༻ Ԡ༻ Ԡ༻ Ԡ ༻
9. Ԡ༻ Ԡ༻ Ԡ༻ Ԡ ༻ جૅ جૅ جૅ جૅ جૅ جૅ جૅ جૅ جૅ جૅ
10. جૅ جૅ جૅ جૅ جૅ جૅ جૅ جૅ جૅ جૅ Ԡ༻ Ԡ༻ Ԡ༻ Ԡ ༻
11. ࠓ೔͸ ϦΞΫςΟϒϓϩάϥϛϯά(RP) ͱ Swift Concurrency
12. © ZOZO, Inc. 12 ࣌୅എܠͱղܾ͍ͨ͠՝୊ 4XJGUͰJ04ΞϓϦΛॻ͚ΔΑ͏ʹͳͬͨ
    ઃܭύλʔϯ͕ྲྀߦΓɺ31 ϦΞΫςΟϒϓϩάϥϛϯά ΋ ྲྀߦͬͨ
    4XJGU6*ͱ$PNCJOF͕ग़ͨ
    4XJGU
    $PODVSSFODZ͕ग़ͨ Θͨͨͪ͠͸Ͳ͜΁޲͔͑͹͍͍ͷ͔ʁ 
    
    
    
13. © ZOZO, Inc. 13 ϦΞΫςΟϒϓϩάϥϛϯά(RP)ͱ
 Swift Concurrency 4XJGU
    $PODVSSFODZ ϦΞΫςΟϒϓϩάϥϛϯά ඇಉظϓϩάϥϛϯά σʔλετϦʔϜ ϥΠϒϥϦͰ͋Δ ݴޠͰ͋Δ ʮ͍ΘΏΔRPʯΛ ࣮ݱ͍ͨ͠ ฒߦॲཧΛ࣮ݱ͍ͨ͠ ڞ௨఺
14. © ZOZO, Inc. 14 ʮ͍ΘΏΔRPʯ ※͝஫ҙ 31ͷࢦ͢΋ͷ͸ॾઆ͋ΔͷͰɺ͜ͷεϥΠυͰ͸ɺΈͳ͞Μ͕J04 ΞϓϦΛ࡞Δͷʹ࢖͏Α͏ͳ΋ͷΛʮ͍ΘΏΔ31ʯ·ͨ͸୯ʹ ʮ31ʯͱݴ͍·͢ɻ ͍ΘΏΔRP ϦΞΫςΟϒϓϩάϥϛϯά (ҰൠͷRPؚΉ) FRP ଞͷRP Functional Reactive Programming iOSΞϓϦΛ࡞Δͱ͖ʹ ࢖͏RP αʔόαΠυ Ϋϥ΢υ ͱ͔
15. © ZOZO, Inc. 15 ʮ͍ΘΏΔRPʯ ※͝஫ҙ ͍ΘΏΔ31Ͱ͸ɺ6*͕ͦ͜31Λ࢖͏ཧ༝ͷத৺ͱͳΔͱ͍͏ಛ௃͕ ͋Δ
    ͜ΕΒΛܨ͙
    &
    6*
    &
    ωοτϫʔΫ
    &
    ଞʹ΋ɺηϯαʔɾΧϝϥɾपลػثͳͲͳͲ
16. RPͱपลͷؔ࿈ͷ੔ཧ & ݱঢ়ͱաڈͷ͢Γ͋Θͤ
17. © ZOZO, Inc. 17 RPؔ࿈ਤ ......ྩ࿨4೥࠷৽൛(งғؾ) struct, class, var, didSet, closure, property wrapper, … Swiftجຊػೳ async/await, AsyncStream, … Swift Concurrency swift-async-algorithms, AsyncChannel, … ඇಉظϓϩάϥϛϯά ReactiveSwift RxSwift Combine + UIͷΞμϓλ RPϥΠϒϥϦ ·ͩͳ͍? RPϥΠϒϥϦ (iOSΞϓϦ޲͚) RP (Ұൠ) ͍ΘΏΔϦΞΫςΟϒϓϩάϥϛϯά RP (iOSΞϓϦ)
18. © ZOZO, Inc. 18 RPؔ࿈ਤ ......Swift ConcurrencyҎલ struct, class, var, didSet, closure, property wrapper, … Swiftجຊػೳ ඇಉظϓϩάϥϛϯά ReactiveSwift, RxSwift, Combine + UIͷΞμϓλ RPϥΠϒϥϦ RP (iOSΞϓϦ) RPϥΠϒϥϦΛඇಉظ༻్Ͱ ࢖͍ͬͯΔέʔε ͨͩͷඇಉظ completion handlerͱ͔ ͍ΘΏΔϦΞΫςΟϒϓϩάϥϛϯά MVVMͷܨ͗ͱ͔ completionͱdidSetͰܨ͍Ͱ΋޿ٛͷRP͔΋...?
19. © ZOZO, Inc. 19 RPؔ࿈ਤ ......Swift ConcurrencyҎ߱Ͳ͏ม͑Δ͔ struct, class, var, didSet, closure, property wrapper, … Swiftجຊػೳ async/await, AsyncStream, … Swift Concurrency ඇಉظϓϩάϥϛϯά ReactiveSwift, RxSwift, Combine + UIͷΞμϓλ RPϥΠϒϥϦ RP (iOSΞϓϦ) RPϥΠϒϥϦΛඇಉظ༻్Ͱ ࢖͍ͬͯΔέʔε ͨͩͷඇಉظ ͍ΘΏΔϦΞΫςΟϒϓϩάϥϛϯά MVVMͷܨ͗ͱ͔ async/awaitͱdidSetͰܨ͍Ͱ΋޿ٛͷRP͔΋...? Swift ConcurrencyΛ ࢖ͬͨ΄͏͕ ྑͦ͞͏ ͦͷ·· RPϥΠϒϥϦΛ ࢖͏ͱྑͦ͞͏
20. © ZOZO, Inc. 20 struct, class, var, didSet, closure, property wrapper, … Swiftجຊػೳ async/await, AsyncStream, … Swift Concurrency ඇಉظϓϩάϥϛϯά ReactiveSwift, RxSwift, Combine + UIͷΞμϓλ RPϥΠϒϥϦ RP (iOSΞϓϦ) RPϥΠϒϥϦΛඇಉظ༻్Ͱ ࢖͍ͬͯΔέʔε ͨͩͷඇಉظ ͍ΘΏΔϦΞΫςΟϒϓϩάϥϛϯά MVVMͷܨ͗ͱ͔ async/awaitͱdidSetͰܨ͍Ͱ΋޿ٛͷRP͔΋...? Swift ConcurrencyΛ ࢖ͬͨ΄͏͕ ྑͦ͞͏ ͦͷ·· RPϥΠϒϥϦΛ ࢖͏ͱྑͦ͞͏ ͍ΘΏΔRPͷ෦෼΁
21. UIͱσʔλϑϩʔ
22. © ZOZO, Inc. 22 σʔλϑϩʔ 31Ͱ͸6*ΛؚΉσʔλϑϩʔΛ੩తʹهड़ ͢Δͷ͕໨త
    ྫ
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    31ͷͳ͍4XJGUͰ͸ɺʮ͜ΕΛ࠶ܭࢉ͢ Δʯ໋ྩจ͕ඞཁ
    ੩తʹॻ͚ͳ͍ ͜ͷྫ: https://reactivecocoa.io/philosophy.html in in out A = B + C var a: Int var b: Int { didSet { a = b + c } } var c: Int { didSet { a = b + c } }
23. © ZOZO, Inc. 23 ໋ྩతͱ͔એݴతͱ͔ એݴతͷྨٛޠ
    ੩త
    ͦΕͬΆ͍ྫ
    "VUP
    -BZPVU
    $PEBCMFͰ"1*
    ϦΞΫςΟϒϓϩάϥϛϯά ໋ྩతͷྨٛޠ
    ಈతɾखଓత
    ͦΕͬΆ͍ྫ
    खಈϨΠΞ΢τ
    v.frame = ...
    ࣙॻऔΓग़͠Ͱ"1*
    d["id"] = 42
    खͰσʔλߋ৽
    updateState(); updateUI()
24. © ZOZO, Inc. એݴతͷྨٛޠ
    ੩త
    ͦΕͬΆ͍ྫ
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    -BZPVU
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    ಈతɾखଓత
    ͦΕͬΆ͍ྫ
    खಈϨΠΞ΢τ
    v.frame = ...
    ࣙॻऔΓग़͠Ͱ"1*
    d["id"] = 42
    खͰσʔλߋ৽
    updateState(); updateUI() 24 ઐ໳ಛԽ ඼࣭Αͦ͞͏ ͦΕͧΕษڧ͠ͳ͍ͱग़དྷͳ͍ ͠͹͠͹ʮΉ͍ͣʯͱ͞ΕΔ ͍ͭͰ΋ྗٕͰॻ͚Δ ॲཧൈ͚Ͱෆ۩߹ग़ͦ͏ ଞͷݴޠ͔͠஌Βͳͯ͘΋ษڧ͠ͳ͘ ͯ΋ͳΜͱ͔ॻ͚ͦ͏ ʮ࢓༷ɾઃܭʯʹ͍ۙهड़ ʮ࢓༷ɾઃܭʯΛ໋ྩʹ຋༁͢Δ ͍͔ʹ΋ͳϓϩάϥϛϯάͷ͓͠͝ͱ ໋ྩతͱ͔એݴతͱ͔
25. © ZOZO, Inc. એݴతͷྨٛޠ
    ੩త
    ͦΕͬΆ͍ྫ
    "VUP
    -BZPVU
    $PEBCMFͰ"1*
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    ಈతɾखଓత
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    खಈϨΠΞ΢τ
    v.frame = ...
    ࣙॻऔΓग़͠Ͱ"1*
    d["id"] = 42
    खͰσʔλߋ৽
    updateState(); updateUI() 25 ઐ໳ಛԽ ඼࣭Αͦ͞͏ ͦΕͧΕษڧ͠ͳ͍ͱग़དྷͳ͍ ͠͹͠͹ʮΉ͍ͣʯͱ͞ΕΔ ͍ͭͰ΋ྗٕͰॻ͚Δ ॲཧൈ͚Ͱෆ۩߹ग़ͦ͏ ଞͷݴޠ͔͠஌Βͳͯ͘΋ษڧ͠ͳ͘ ͯ΋ͳΜͱ͔ॻ͚ͦ͏ ʮ࢓༷ɾઃܭʯʹ͍ۙهड़ ʮ࢓༷ɾઃܭʯΛ໋ྩʹ຋༁͢Δ ͍͔ʹ΋ͳϓϩάϥϛϯάͷ͓͠͝ͱ ໋ྩతͱ͔એݴతͱ͔
26. © ZOZO, Inc. એݴతͷྨٛޠ
    ੩త
    ͦΕͬΆ͍ྫ
    "VUP
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    $PEBCMFͰ"1*
    ϦΞΫςΟϒϓϩάϥϛϯά ໋ྩతͷྨٛޠ
    ಈతɾखଓత
    ͦΕͬΆ͍ྫ
    खಈϨΠΞ΢τ
    v.frame = ...
    ࣙॻऔΓग़͠Ͱ"1*
    d["id"] = 42
    खͰσʔλߋ৽
    updateState(); updateUI() 26 ઐ໳ಛԽ ඼࣭Αͦ͞͏ ͦΕͧΕษڧ͠ͳ͍ͱग़དྷͳ͍ ͠͹͠͹ʮΉ͍ͣʯͱ͞ΕΔ ͍ͭͰ΋ྗٕͰॻ͚Δ ॲཧൈ͚Ͱෆ۩߹ग़ͦ͏ ଞͷݴޠ͔͠஌Βͳͯ͘΋ษڧ͠ͳ͘ ͯ΋ͳΜͱ͔ॻ͚ͦ͏ ʮ࢓༷ɾઃܭʯʹ͍ۙهड़ ʮ࢓༷ɾઃܭʯΛ໋ྩʹ຋༁͢Δ ͍͔ʹ΋ͳϓϩάϥϛϯάͷ͓͠͝ͱ ໋ྩతͱ͔એݴతͱ͔
27. © ZOZO, Inc. એݴతͷྨٛޠ
    ੩త
    ͦΕͬΆ͍ྫ
    "VUP
    -BZPVU
    $PEBCMFͰ"1*
    ϦΞΫςΟϒϓϩάϥϛϯά ໋ྩతͷྨٛޠ
    ಈతɾखଓత
    ͦΕͬΆ͍ྫ
    खಈϨΠΞ΢τ
    v.frame = ...
    ࣙॻऔΓग़͠Ͱ"1*
    d["id"] = 42
    खͰσʔλߋ৽
    updateState(); updateUI() 27 ઐ໳ಛԽ ඼࣭Αͦ͞͏ ͦΕͧΕษڧ͠ͳ͍ͱग़དྷͳ͍ ͠͹͠͹ʮΉ͍ͣʯͱ͞ΕΔ ͍ͭͰ΋ྗٕͰॻ͚Δ ॲཧൈ͚Ͱෆ۩߹ग़ͦ͏ ଞͷݴޠ͔͠஌Βͳͯ͘΋ษڧ͠ͳ͘ ͯ΋ͳΜͱ͔ॻ͚ͦ͏ ʮ࢓༷ɾઃܭʯʹ͍ۙهड़ ʮ࢓༷ɾઃܭʯΛ໋ྩʹ຋༁͢Δ ͍͔ʹ΋ͳϓϩάϥϛϯάͷ͓͠͝ͱ ໋ྩతͱ͔એݴతͱ͔
28. © ZOZO, Inc. 28 σʔλϑϩʔ A = B + C C B A + in in out ͪͳΈʹσʔλϑϩʔͷਤͱ͍͏ͱ
    ԼͷΑ͏ͳײ͡ ͜ͷྫ: https://reactivecocoa.io/philosophy.html
29. © ZOZO, Inc. 29 σʔλͷശ + ઀ଓͷ໼ҹ C B A + ʮม਺ͱ͸ശͰ͋ΔʯശΛܨ͍ͩ΋ͷ͕ σʔλϑϩʔͰ͋Γ31
    ͨͩ͠σʔλϑϩʔͷശ͸ɺ
    มߋ఻೻ͷػೳΛ΋ͭ͜ͱ MutableProperty BehaviorRelay CurrentValueSubject @Published ֤ϥΠϒϥϦͰͷʮശʯ
30. © ZOZO, Inc. 30 σʔλͷശ + ઀ଓͷ໼ҹ C B A + map flatMap filter combineLatest : ശͱശͷ઀ଓ͸໼ҹ ্ྲྀɾԼྲྀ͕͋Δ
    ʮΦϖϨʔλʔʯͱݺ͹ΕΔ ֤ϥΠϒϥϦͰͷʮ໼ҹʯ
31. © ZOZO, Inc. 31 σʔλͷശ + ઀ଓͷ໼ҹ ઀ଓͷ໼ҹ͸ඇಉظͰ΋Α͍ɻ࣌ؒతͳॲཧΛͯ͠΋Α͍ɻ
    ෭࡞༻Λ࣮ߦͯ͠΋Α͍ɻ
    ͜Ε͕31ϥΠϒϥϦͷ࣮૷Λ࢖͏ͱศརͩͱΑ͘ݴΘΕΔ෦෼ debounce throttle : ୹͍࣌ؒʹͨ͘͞ΜมԽͯ͠΋ ճ͚ͩ఻͑Δɺͱ͔ ֤ϥΠϒϥϦͰɺ࣌ؒͰ ؒҾ͖͢Δʮ໼ҹʯ
32. © ZOZO, Inc. ؅ཧ͢΂͖ঢ়ଶ͸ͲΕ͚ͩ͋Δ͔
    ͦΕΛശʹ͢Δ
    ঢ়ଶ͕มΘͬͨͱ͖ɺശ͔Βശ΁఻೻͢΂͖͔
    ͦΕΛ໼ҹʹ͢Δ
    σʔλϑϩʔͷ֎͔ΒมߋͰ͖Δശ͸
    σʔλϑϩʔͷ֎΁Өڹ͢Δശ͸
    มߋ఻೻͕͋Δ͚ͩͰɺϝϯόม਺ͷઃܭͱมΘΒͳ͍
    Ұ࣌ม਺΋Ұ࣌తͳശ΋ϝϯόʹ࣋ͨͳ͍͍ͯ͘ 32 σʔλϑϩʔΛઃܭ͢Δ
33. © ZOZO, Inc. ߏ଄తʹ֎ଆ͔ΒΈΔͱγϯϓϧʹΈ͑Δ 33 σʔλϑϩʔΛઃܭ͢Δ
34. © ZOZO, Inc. 34 UIͱͷ઀ଓ(ೖޱɾग़ޱ) *#"DUJPOͰड໋͚ͯྩతʹೖྗ
    B.value = text
    6*ΞμϓλͰശ૬౰ͷ΋ͷ͕͋Δ
    B = fieldB.reactive.textValues B A PCTFSWF
    TVCTDSJCF
    TJOL໋ͯ͠ྩతʹग़ྗ
    labelA.text = $0
    6*ΞμϓλͰശ૬౰ͷ΋ͷ͕͋Δ
    labelA.reactive.text <~ A σʔλϑϩʔͷ֎ͱ͸໋ྩతʹ΍ΓͱΓ͢Δ͔ɺϥΠϒϥϦʹ༻ҙ͞Ε ͍ͯΔ6*ΞμϓλΛ࢖ͬͯσʔλϑϩʔͷҰ෦ͱͯ͠઀ଓ͢Δ
35. © ZOZO, Inc. APIϨεϙϯε ετϦʔϛϯά payload 35 UIҎ֎ͷೖޱɾग़ޱ 6*ʹ௚͍݁ͯ͠ͳ͍ΠϕϯτΛೖޱ΍ग़ޱͱ͢Δ͜ͱ͸͋Δ ηϯαʔ஋ ݕࡧςΩετ ೖޱ ηϯαʔ
    J#FBDPOΛݕ஌ͨ͠ͱ͔ɺͳΜͰ΋ ωοτϫʔΫ ݕࡧςΩετ͕มߋ͞ΕͨΒ"1*ϦΫΤετ ग़ޱ
36. © ZOZO, Inc. ֤ϥΠϒϥϦͰͷʮശ૬౰ʯ 36 RPͰσʔλϑϩʔʹ઀ଓͰ͖Δ ͦͷଞͷϞϊ جຊతͳσʔλϑϩʔΛ֦ுͯ͠͞Βʹߴ౓ʹ Ͱ͖ΔϞϊ͕֤31ϥΠϒϥϦͰ༻ҙ͞Ε͍ͯΔ
    લड़ͷʮശ૬౰ͷ΋ͷʯͳͲ
    APIϨεϙϯε ετϦʔϛϯά payload ηϯαʔ஋ Signal SignalProducer Observable Publisher
37. Swift Concurrency͔? RP͔?
38. © ZOZO, Inc. 38 ͍ΘΏΔඇಉظϓϩάϥϛϯάͷ෦෼͸ɺ
    ঃʑʹ4XJGU
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